Lithium Battery Image

Lithium Battery

Bms red led on and off

Hi All,

Just installed 4 smart 200ah lithium, with new multi’s (3) 12/3000/120 12v, cerbo, bms etc. Batteries are all fused individual and connected to busbar’s.

Charge disconnect is done via Mastervolt alpha pro, via bms fort the multi’s, load disconnect is organized.

The batteries are new. When charging it worked for about 3 hours with about +/-170 amps (set as limit). After a while the red led on bms started to go on and off and the chargers go up and down as well. Is this a malfunction or are the cells being balanced? the red led says hi voltage or temperature. This is not the case when I check the individual batteries with bluetooth. Some cell imbalance is there in the individual cells.

Is it normal or not?

Thx!

gertjand asked
bathnm commented ·

0 Answers

The 1,5 kWp PV to 100 Ah Lithium rule

Some questions about this rule to those who understand all the implications,

Is the PV array size, for the purpose of calculating this rule out, the STC rating of the array or the NMOT rating (more realistic real world performance)? I am guessing most would say use the STC rating but can we safely use the NMOT rating or not? Does Victron say anything about this? We all know we dont get the rated power of the PV panel, so why calculate battery size based on a wattage we will never achieve?

For example, say a PV array of 60 panels at 450w.

In STC terms this is 27 kWp (60 x 450 = 27000). In NMOT terms its 20.3 kWp (60 x 338 = 20280)


So if we follow the 1.5KWp PV to 100 Ah lithium rule for the STC rating of this array it would be ;

STC PV 27 kWp / 1.5 kWp = 18 | 18 * 100 Ah = 1800 Ah | 1800 Ah x 50 V = 90 kW battery .


So if we follow the 1.5KWp PV to 100 Ah lithium rule for the NMOT rating of this array it would be ;

NMOT PV 20.3 kWp / 1.5 kWp = 13.5 | 13.5 * 100 Ah = 1350 Ah | 1350 Ah x 50 V = 67.5 kW battery.


Thoughts ?


mark-young asked
mark-young answered ·

2 Answers

Lifepo4 capacity and lynx shunt calibration

Hello from sunny south florida,

I an Electrician and my company assigned me that task of building out a camper van for a client. After some research I ended up using a multiplus 12/3000 with a CCGX, the lynx shunt 1000a, a 45amp mppt solar charger with ~250w worth of solar panels on top of the van(I wanted more panels but customer wanted more storage)and 2 renogy 170Ah lifepo4 batteries in parallel, and an alternator charger. The equipment seems to be operating as it should with the exception 1 thing that just popped up last night. The load on the system is roughly 20w to power the ccgx and the cellular internet (according to my CCGX).

20200522_144703.jpg

[image]

with the rating of the batteries at 2175w each i estimated the system should run for ~200hrs +/-with no charge, ive been monitor the vehicle through VRM and it all has checked out until yesterday..the customer has had the van parked not in use all of last week. We had good weather all week with the exception of friday when it was cloudy all day and the solar didnt produce much.

To get to the point though the batteries died after ~ only 24-32hrs of no input am i mis-calculating something here or do i need to look into the current calibration of the system?


dan3i asked
dan3i commented ·

1 Answer

Victron Inverter chargers and float voltages ? why do they not retain ...

Good day all . A question thats been burning me for a while .. given that ive installed alot of lead acid and lithium systems i have been evaluating the charge and float profiles and their results ... i find this alot in systems with Standby application no solar .. and alot with No comms to batteries no canbus or DVCC enabled.. Just a plain backup ..
So Scenarios are such inverter charging battery from the grid and battery permanently connected to the inverter as should be.
the inverter charges up to 100% and reaches 55.7v (16s Lifepo4)
then the system switches to float where is should retain voltage --- NOT HAPPENING
then a rebulk or re absorb should take place in 7 days .. ---NOT HAPPENING

technically a 0.2v per 12v method is used meaning in a 48v system we should get a drop on float voltage of 0.8v to get a reabsorb ... ---- NOT HAPPENING.

Alot of battery systems use contactors and Bms systems internally which account for internal draw from the battery cells . and in which case means that the battery does take some load to retain the voltage from the inverter ..
We get to point where the SOC falls and falls and battery is never recharged with lithium ticked ...

But why would this not take place on the inverter with a predefined float value is my question and why does the deviation value not kick in the recharge .. when lower then 0.8v below float ?


A little more details i feel should be added in .
Two different inverter units, one multiplus 3000va 48v unit
the other multiplus 5000va 48v unit.
Both when set to a float voltage of 50.6 to 50.7 charge the battery to 100% Lifepo4 . 15s configuration .. after this process they dont retain the float voltage of 50.7 ... the battery has bms and circuitry internally that uses power.
Storage Not ticked .
Lithium batteries Ticked on
Both units are used only for power back up purposes and both units have Venus GX connected .. Pulling my hair out .
Please can some one chime in .. I dont want to have to run with DVCC as this is not 100% working and surely the default profile to Float maintain voltage should do its job unless i am missing something often after two weeks or so the voltage of the batteries drops to around 48v .. Not good .

nismoboy34 asked
Guy Stewart (Victron Community Manager) commented ·

0 Answers

Charging characteristic Multiplus 12|1200|50 and LiFePO4

Charging switches on and off constantly.


Good news is, that the charging of my 3 x 150 Ah LiFePO4 batteries via 230 V works. They are fully charged. However, even on low consumption (i.e. 7 A) the Multiplus would switch the charging function on and off literally every 2-3 minutes when 230 V input is connected. Thats annoying.

I have set the DIP switches to LiFePO4 Battery (ds2=off, ds3=on and ds6 for saving of settings).

Is there any option I can activate in order for the Multiplus to accept a certain discharge before bulk charge switches on again?

lejouz asked
lejouz commented ·

2 Answers

Sailboat Multiplus install

Have a 2001 Beneteau 361 with a Xantrex Freedom 20 and failing batteries. Want to upgrade to 300-400Ah LiFePO4 batteries 12V and a Victron 3000W Multiplus.

Have repurposed one of the Victron diagrams to take a stab at the necessary components. 20201011 Beneteau 361 Electrical Schematic.pdf

Would love feedback.

The shore power is currently two 30A 120V circuits. One powers the Air Conditioning and the other goes to the Xantrex Freedom 20. Planning on having one 50A 120V (three wire) plug and a Victron Galvanic Isolator. The single shore power line would feed to the Multiplus, then split with one circuit to the Air Conditioner (would disconnect if shore power is lost) and the other to the AC panel.

The house battery bank would be 3 or 4 100Ah BattleBorn batteries that have internal BMS. Question: Does the 3000W Multiplus require 400Ah battery bank or is 300Ah okay?

The engine start battery is a FLA connected to a 100 A Balmar alternator with a MC-412 regulator. The alternator would directly charge the engine start battery.

A Renogy 50A DC-DC charger with MPPT would connect to the alternator to provide charging to the LiFePO4 battery bank. Solar is planned in the future and would connect to the Renogy DC-DC charger.

A Cerbo GX with the GX Touch 50 display will be purchased and a BMV 712 battery monitor.

Question: There are 3 switches. Wondering if they are configured correctly. The bilge pump is unswitched, as is the Renogy DC-DC charger.

Question: Did not include a Cyrix Li Charge or a Smart Battery Protect. Are these needed? The Battleborn batteries have a low voltage cutoff in the BMS.

Plan on expanding the system to integrate with a Raymarine or B&G suite, tank sensors, remote management, relays, etc.

scfoster asked
JohnC commented ·

2 Answers

How do I set up VE configure with the Sirius Kilowatt Labs Capacitor module

How do I set up VE configure with the Sirius Kilowatt Labs Capacitor module

Marc asked
petajoule edited ·

0 Answers

How to wire MPPT and DCDC charger in same system

I am getting a 120amp LifePo4 and wanting to charge from both Victron solar and dcdc from starter battery

Will these two interfere with each other whilst driving? I have heard that they can cancel each other out.
Should I include a manual switch so I can choose to use one or the other? Or is there another way to insure that my batteries will be getting charges whilst driving.
thanks!!

rubytuesday asked

0 Answers

Can I remove 4 batteries from this setup?

I have 2 batteries on each of my 2 Cummins engines at 12 volts and 4 batteries for my bow thruster at 24 volts. Can I eliminate the 4 engine batteries and tie them into my thruster batteries assuming the bow thruster is not on a common ground? See Pic

[image]

kurt404 asked
kurt404 answered ·

3 Answers

Charging via Critical Output when in BackUp Mode

Hello! Our client is using our 3P+N DC-AC bidirectional invertor connected to the Critical Load Output of your invertors. The same connection was tried on the following sets. Set #1. "Victron with 3X3 kVA inverters connected in star – 400V+ neutre – 50 Hz" Set #2. "Victron with 3X10 kVA inverters connected in star – 400V+ neutre – 50 Hz" They ask why our invertor does not discharge to your system when VICTRON is in a backup mode (disconnected from the grid). When VICTRON system is connected to the grid, things work Ok. Basically, the customer wants to make VICTRON connected batteries to charge from our invertor when VICRTRON is in the back up mode. I would like to ask if: 1) Critical AC Output of VICRTON invertors are designed to be used for a power injection from "LOAD" to VICTRON in backup mode at all? 2) Are there any assumtions why this scheme would not work with respect to VICTRON embedded logic? Thank you in advance for your support.

alexqqqqq asked

0 Answers

Replacing/Coexisting Sargent campervan components with Victron

Good evening,

We are looking into upgrading the battery and solar panel system of our campervan and for that purpose, we think we will need to replace some Sargent components with Victron components.

Currently, we have an 80W solar panel, connected to PWM Regulator (https://sargentltd.co.uk/shop/product/10amp_solar_regulator/122)
The regulator is connected to a EC500 Power Supply Unit (https://sargentltd.co.uk/shop/product/ec500_power_supply_unit/179)
The EC500 PSU can be controlled with EC480 Control Panel (https://sargentltd.co.uk/shop/product/ec480_control_panel/180). The control panel can be used to monitor the solar input for the solar panel, the status of the vehicle battery and the leisure battery. It can also be used to switch the charging from leisure battery to vehicle battery.
Finally, the EC500 PSU is connected to the PX300 charger (https://sargentltd.co.uk/shop/product/px300_charger/152) that is connected to the battery (Lithium LiFeP04 Professional 12 V 110 AH)

We would like to know the following replacement/installation is doable and what product should we aim for?
1) A new Victron MPPT solar charge controller that can handle up to 2 x 100/120W solar panel
2) The output of the Victon MPPT should be fed into the EC500 so that it can be monitored by the EC480
3) A new Victron battery charger that can support up to 2 x Lithium LiFeP04 Professional 12 V 110 AH in parallel (or the vehicle battery). The output should be managed by the EC480 so that it can be switched to charge the 2 Lithium batteries or the vehicle battery as it does today)
4) A new Victron 1200W pure sinus inverter where the output is connected to the EC500 in such a way that the existing 220V sockets in the van can be used with normal appliances (in the same way as connected to the mains)

Any good suggestion is most welcome.

Thank you!

amidships asked

0 Answers

Split Phase Quattro reading AC input voltage but showing 'Active AC Input Disabled'

Not able to charge batteries. Quattros don't seem to go into charge mode. Voltage readings are present on AC input but Cerbo shows 'Active AC INPUT DISABLED'.


Looking for someone who can help remotely? Willing to pay for system review and configuration help.


Setup:

240V Split phase - 2 Quattro's 24v/5k/120v - 100A Autotransformer

1200Ah Pylontech compatible batteries (3 400Ah in parallel)

220v / 60hz Shore power

10kw Generator

[image]

[image]


[image]

[image]


D S asked
Daniël Boekel (Victron Energy Staff) answered ·

2 Answers

Lifep04 settings with 123/Smart BMS

Desperate HELP PLEASE! My van is currently being rented out by a client, and their electrics have gone down. I've recently been having issues with it not working properly i.e BMS saying batteries at 16% full and controller in Float, suggesting they're full. I'm sure it's as simple as a settings issue, I just need to know what settings to use!


Here is my setup:

Victron Energy SmartSolar MPPT Charge Controller 150V/45A-Tr


3 x 200w Solar panels:

Specifications:

  • Peak power: 200W
  • Maximum power voltage: 38.80V
  • Maximum power current: 5.15A
  • Open circuit voltage: 45.00V
  • Short circuit current: 5.80A
  • Power tolerance: 0/+3%


Batteries: Wonston LiFeYPO4 (3.2V/300Ah) x 4 cells.

https://shop.gwl.eu/Winston-40Ah-200Ah/WB-LYP300AHA-LiFeYPO4-3-2V-300Ah.html


BMS:

BMS123SM-SET BMS123 Smart - Complete Set (4 cells) with Bluetooth 4.0


I need to know the following settings, as i think mine are not correct:

[image]


I was told, to disable the Equalisation Voltage, that i have to set it to 1. But I can only change it to a min of 9. I need to know what i should set all the other settings to, to get best performance. I have no idea why it's not working, but it's not :(



For example, this was on a beautiful, sunny day, and I was getting nothing from the solar, as it seems it assumed the batteries were full:

[image]

[image]


PLEASE! ANY ADVICE IS MOST WELCOME!!!


Many, many thanks!!!

glennyg asked
klim8skeptic commented ·

1 Answer

EasyPlus Compact 12/1600/70 connected to Lithium via Smart BMS CL 12V 100A

Evening All

I have EasyPlus Compact, Venus GX, multiple MPPTs and AGM House Batteries (2x 160Ah) - all working well. On a yacht, with engine and starter battery.

Now planing the upgrade from AGM to Victron Smart Lithium (3x 200Ah). The main issue I face is protecting my engine alternator from the hungry Lithium.

My preferred weapon of choice is the BMS CL 12V 100A. From my research this seem to solve all the protection issues (protects the alternator from the Lithium, protects the lithium from various events through the BMS).

The issue is how to connect the EasyPlus Compact to the BMS CL 12V 100A. I have read the Victron PDF (Cable for Smart BMS CL 12-100 to MultiPlus) - suggesting the part number I need is PN: ASS070200100 - but this clearly states "Multiplus" - and makes no mention of EasyPlus Compact.

Anyone know of the Cable for Smart BMS CL 12-100 to MultiPlus (ASS070200100) will work with the EasyPlus Compact ?

Any other comments / suggestions regarding this upgrade would be welcomed !

Thanks

Tim

miya asked
miya commented ·

1 Answer

Recalibration of temperature offset (Smart Lithium 200Ah-a)

Was manually changing the offset for my batteries.

What should I do to let the system recalibrate the offset values?

mhuusko asked
stefanie answered ·

1 Answer

12v Superpack (house bank) Balancing

I started with (x2) 200ah, 12v Superpacks (400ah total, in parallel) each connected to my Lynx Bus with 2 pairs of 2/0 wires. I also have a Multiplus 12/3000 inverter/charger in the Lynx Bus.


NEXT, I needed a bit extra capacity to run an air conditioner so I added a 3rd (now 600ah total) superpack.


Is there some specific charging and discharging cycle I should perform to “balance” all 3 batteries?


Also, I didn’t have enough 2/0 wire on hand to go straight to the bus so I paralleled straight to one of the other batteries. Is this OK?

Thoughts & recommendations welcome.

octafish asked
octafish edited ·

0 Answers

Absorption time should be settable to less than 1 hour with lithium

Currently my Quattro (and multi) only allows a minimum of one hour of absorption time on initial charge (even though it allows .25 hours on repeated absorption).

My (and arguably most) lithium batteries require very little absorption time. So forcing them into a 1 hour absorption is both unnecessary and potentially causes extra wear on lithium batteries.

I would like to see the base absorption time settable to, at the very least, the same levels as with repeated absorption, or to even smaller window sizes.

Ideally I'd put my batteries in 10 minutes of absorption.

geomz asked
kirtap commented ·

4 Answers

Reading 8-9v on Lynx Bus with Multiplus Inverter disconnected

I’m currently doing some testing on my new system where I physically disconnect my Multiplus inverter, DC-DC chargers, Solar MPPPt, and Lithium Superpacks but I still get 8.5-9 Volts on the main Lynx Bus.

When I turn OFF the Multipluss, the voltage starts to go down slowly to 0v in about 10 seconds.


Is this normal behavior?

Might a Voltage Sense, Temperature Sense, Bluetooth dongle connection be causing this issue?

All the key components are disconnected, what else might I look for?


thanks!

octafish asked

0 Answers

How can I increase the charge voltage of my 48 volt lithium battery?

I have a Smart Solar 150/35 mppt Charging a 48 volt (16 cell) nominal system. At mid day with 52.5 volts indicated on battery voltage and In bulk mode charging I often see low (40w) current input. I am set on battery life for charge algorithm. Bank voltage of 53 volts is only 3.3 volts Per cell. I’d like to get a final charge closer to 55 - 56 volts. Can that be done?

mark-f asked
wkirby commented ·

3 Answers

lithium-ion battery warmer

I am going to make a box to put my lithium-ion batteries in and wanted to know if there is a heat pad or heater that will work good to put in the box for keeping the temperature above 32 degrees. So I wont damage the battery when charging when temperatures are below freezing.

ejm asked
wkirby answered ·

1 Answer

Max Number of Pylontech US3000's on MultiPlus II 5000

Whats the max qty of Pylontech US3000 batteries I can put on a MultiPlus II 5000?

mick-finch asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

My LifeP04 batteries switch off, can I set that voltage ?

I have a 24v MultiPlus with 4x 12v LifeP04 batteries, and they switch off at around 24v. Can this be changed as once they have switch into safe mode at night one is crippled.

Jonathan Simpson asked
Matthias Lange - DE commented ·

0 Answers

Intermittent fault with Smart Battery Protect

I have a Smart Battery Protect 12/24 100A being used as part of a lithium system with a VE.Bus BMS and an Orion 24/12- 70. Basically, I am using the Smart Battery Protect in Li-ion mode which is controlled by the load disconnect on the VE.Bus BMS, this circuit is the supply for the DC House panel.

The problem I am having is that there is an intermittent fault where the Smart Battery Protect gets stuck on “Attempting to activate” (in Victron connect) and causes the RV interior lights to constantly flash on and off. Occasionally after being stuck on “Attempting to activate” for a while, it will display an E1- Short circuit error (both on the unit and in Victron connect); however, I am 100% certain that there is no short circuit. Sometimes it will work fine for hours, and then if the breaker for the house panel is switched on and off it will then get stuck in this fault and it is nearly impossible to get it working again.

So far, we have tried a second DC-DC Converter, a second working battery protect and are still getting the same fault. The cable runs to the input and from the output of the battery protect are appropriately sized, and the BMS is in the same compartment so the ground wire and the load disconnect to Remote H on the battery protect are only approximately 0.5m. We have since discovered that we can trick the battery protect into working every time it gets stuck in this fault by briefly touching a 24V supply on the output of the battery protect.

Has anyone experienced this problem before and discovered a solution?

linky asked
spasq0712 answered ·

3 Answers

BlueSolar MPPT 75/15 Solar Controller > 15AH Lifepo4

Hi All,

If I connected my 100W solar blanket up to this controller, set the profile for Lithium battery, would the output of the MPPT supply only up to max of battery Max Charge Current? i,e, will 15A be supplied to the battery even if it can only accept max 5A? will I ruin the battery? specs of battery are below.


SolarKing Lithium batteries are fully sealed with a built in battery management system (BMS) to make sure the battery operates safely.

  • Operating Temperature Range: -20°C ~ +60°C
  • Voltage: 12.8VDC
  • Amperage: 15AH
  • Max Discharge Rates: 10A
  • Max Continuous Current: 10A
  • Max 10 Second Pulse: 15A
  • Min Charge Current: 1A
  • Nominal Charge Current: 3A
  • Max Charge Current 5A
  • Charge Voltage 14.8V
  • Maximum Charge Voltage 15.0V
  • Cycles @ 100% DOD 2000 Cycles
  • Cycles@ 80% DOD 3000 Cycles
  • Cycles@ 50% DOD 3500 Cycles
  • Cycles@ 30% DOD 8000 Cycles
  • Low Voltage cut out: 10.0VD
  • Terminal T6.5mm



tim-cooper asked
michelg commented ·

2 Answers

Lithium battery charging in Arctic expedition conditions

@Ur12VMan , @Daniël Boekel (Victron Energy Staff)

Hi 12VMan (and Victron staff please). I found your thread on Lithium battery protect settings while searching, but decided my comment should be a new question.

Thanks for your answer in that thread, mentioning that Victron lithium batteries issue a temperature alert at 5C. This gets my attention. My research to date was indicating that lithium batteries are OK for charging down to around 1C (and for discharging well below 0C, as an aside). I need to pursue this, as I'm planning to use Victron LiFePO4 batteries in Arctic conditions, in an expedition yacht that will be static for days to a week or two. Water temps will be down to around 2-3C, sometimes lower depending on icing. I'm looking into the need for heating for the battery box, which will be under the insulated floorboards and so outside of the primary heated spaces. If 5C is the real deal, I need to get serious with calculations on battery energy that might be consumed in making the batteries warm enough to be chargeable. Or other heating.

So, where is this 5C figure coming from? OK, I see +5C mentioned in the 12.8V LiFePO4 battery data sheet.

This prompts a few specific and important questions, about the Victron 12.8V 300Ah variants:

1. What is the lower internal battery temperature at which the battery signals to a connected BMS that charging is not permitted?

2. If the answer to Q1 is different than +5C, what is the consequence in terms of battery health (and charging efficiency?) of charging occurring between the two temperatures?

3. Does the answer to Q2 depend on the rate of charging?

4. If the internal battery temperature is just high enough for the battery to allow itself to be charged, and in this case at a low rate of 20A per battery (80A from a normal alternator, shared between 4 batteries), will this charging slowly warm the batteries up such that a higher rate of charging can be initiated in due course?

5. At what battery temperature (measured by a sensor on the positive terminal, or is there a way to get the internal temperature?) can high rate charging at ~150A per battery be initiated, such that no appreciable damage to battery health occurs? Would it be prudent to step the charging rate up slowly as the batteries warm up?

Clearly, it will be helpful if I rig a temperature sensor for the battery box, to guide appropriate action before each charging session.

The boat will use an Integrel On-Engine Charger (basically a big and very efficient second alternator) which can charge at up to a very high rate. Or it can be turned off so that charging is via the engine's standard alternator only. I might need to raise the battery box temperature before starting to charge each week or so. Heat from the main engine during these charging events will then help.

Thank you for your help with these questions. :-)

valden asked
michelg answered ·

5 Answers

Observation - ESS Dynamic Cutoff does not interpolate between the 4 thresholds

Observing the battery alarm behavior on a friend's ESS system I noticed the ESS Dynamic cuttoff alarmed when SOC was @ 47% , Discharge current 0.38C and voltage had just dropped below 50V. The dynamic cuttoff used were the Lithium defaults of 52/50/49.2/48V for 0.005/0.25/0.7/2C. It seems the threshold applied was the 0.25C threshold of 50V and not some value between the 0.25C and the 0.7C threshold. Perhaps there can be some enhancement made to so that the alarm curve more closely follows a typical discharge curve curve. Can one disable dynamic cuttoff in an ESS system and only relay on SOC?

merlepeter asked

0 Answers

BMV-712 not detecting both Battleborn Batteries

My BMV-712 is set to 200ah of batteries. I have used all the recommendations for the settings from this community, Victron, and Battleborn. At night when we are only on battery power it will show for example, 14ah used and 86% energy left. That says to me it is only using 100ah.


Has anyone else had this problem?


Should I reset the battery monitor?


Or reset the BMS?


Please help

woodburn asked
Matthias Lange - DE commented ·

2 Answers

Changing to lithium batteries

How do I change my MPPT 100/30 Bluetooth solar charger to lithium batteries?

rosscoc42 asked
fallingbear answered ·

1 Answer

Phoenix Smart IP43 Charger and failure of the charge bus in a dual DC bus system.

I've got a Phoenix Smart IP43 Charger that I'm incorporating into a LiFePO4 24V system in a motorhome. The Phoenix will not be turned on permanently (only when shore power or generator is required). There is also solar charging (this is the primary charging source) occurring on the charging bus via an Electrodacus DSSR20. Both the Phoenix and the DSSR20 are remote controlled by the Electrodacus SBMS0 for overcharge situations.

I'm still doing the planning side of things and have been reading http://nordkyndesign.com/.

I have been following the outline for the dual DC bus system and was just reading through the section outlining a high-voltage event causing a charge bus disconnection.

In the article he says when some charging devices are disconnected under load there is potential for generating a voltage spike and subsequently damaging/destroying them.

The examples he gives are of ;PWM & MPPT charge controllers, wind generators, and alternators.

http://nordkyndesign.com/electrical-design-for-a-marine-lithium-battery-bank/

I was wondering if such a charge bus disconnection, say via a fuse break or a manual switch, would have an impact (like the device destroying voltage spike mentioned) on the Phoenix if it were activated at the time.

Also, would the outcome for the Phoenix differ depending if the DSSR20s (and solar modules) were connected at the time or not?

Thank you!

demosthien asked
demosthien edited ·

1 Answer

Charge Controller For 123W Solar Panel with LiFePo4 Battery..?

Hello All

I hope someone is able to advise me on my 1st post, and please correct any incorrect assumptions I have made.

I have an old Land Rover camper van which has been happily running a 123W solar panel going through a simple MorningStar PWM charge controller to 2 lead acid batteries with a total of 130Ah capacity.

Due to age and excessive discharge the batteries now need replacing.

Despite the relatively high initial cost, I rather fancy the Polinovel LiFePo4 deep cycle batteries to give me significantly more usable Ah capacity in the limited space available. They have some BMS built in, but does not include the all important charge cut-off at under 5 degrees C temperature to avoid damage.

So, I thought what might suit would be a Victron SmartSolar MPPT 75/10. Add a Smart Battery Sense to show temperature and use the VictronConnect app to set the charge to cut-off at under 5 degrees C - will this set up work OK ?

But I am worried that the User Manual says the charger won't start until the battery has 5v less than the solar panel. As the LiFePo4 battery should keep a useable 12v down to say 20% of capacity, does that mean it won't be charged until almost flat at 0% ?

Maybe I should stick with a simple PWM charge controller - but how to detect and cut-off the charge at under 5 degrees C ?

I've done loads of internet research with no solid answer to my situation, and would be very grateful for your good advice.

Many thanks - James.


james130 asked
dazey77 answered ·

1 Answer

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