How to set the right temp compensation value without an external temp sensor?

EasySolar; Multi 48/3KVA, MPPT blue 150/70TR style, CCGX... unfortunately there is no BMV monitor installed and batteries are sited on a isolated compartment (delta temperature is wide), electronics in the same room but outside of the batteries enclousure. Wich would be the better temp comp value to use here?

Through the CCGX could the readings taken by the Multi´s temp sensor be shared with the charge controller?

dcpablo asked
dcpablo commented ·

1 Answer

How the internal temperature compensation feature works on my mppt bluesolar?

"The charger uses its internal temperature for battery temperature compensation when the charger has been idle for at least one hour, i.e. when the charger is not actively charging a battery or supplying a load".

If the charge controller does the reading when it is no charging, i.e. at night, how can it choose the appropiate value if the next process will be maybe the next day and at a different/s temperature/s (along the day)
How does this works?

dcpablo asked
dcpablo answered ·

3 Answers

DVCC for off-grid only?

Hi Guy and Victron team

Do we need DVCC for on grid ESS systems or only for Off-grid as per the guide?



David asked
David commented ·

1 Answer

VRM Remote Console IP Verification


My Installation is in an RV and I provide internet via two different Cellular carriers into to router. I noticed that the VRM remote console works on Verizon, the carrier I used when setting up VRM and Venus. But when I switch my router to use ATT as the carrier, VRM Remote console does not work. I read about the Too Frequent IP Address verification issue in your support documents. Its not clear when it will allow a new IP providing it remains fixed long enough after a change. Or is there a way to tell VRM to accept a new IP? I am still running the internal WIFI on the venus. The USB wifi should arrive tomorrow.

kdrvsolar asked
kdrvsolar commented ·

1 Answer

BlueSolar PWM or MPPT with battery disconnected

I am considering using BlueSolar PWM with 20W total in PV panels on a small boat. We are talking 5m boat.

I would be connecting it to starter battery in order to keep it charged during long periods of not using the boat. On that battery there are some small loads as well, like radio, echo, lightning. We are talking about 12V/50Ah battery.

I would move those loads on a load connection available on pwm, engine directly to the battery and of course pwm directly to the battery.

There is a safety switch on board that is suppose to cut the battery off from the grid completely.

I am wondering if I would be cutting a battery away from BlueSolar PWM, how would that unit take that action and what would happen with power to connected loads (in case there is a full PV activity)?

Miro Vidos asked
Miro Vidos answered ·

4 Answers

Lithium Battery miniBMS / VE Bus BMS / BMS 12/200 - Low temperature protection available?

Hi all,

the data sheet for miniBMS contains the following lines:

"Temp or OVP (red): Charger output free floating (due to cell over temperature (>50°C), cell under temperature (<5 °C) or cell over voltage)."

I could not find a reference to Charge Disconnect at temperatures <5° anywhere else in either the miniBMS manual, VE Bus BMS or BMS 12/200 datasheet or manual. All seem to refer to over temperature only.

On the other hand Li Smart Batteries have an App setting "Allowed to charge minimum temperature". I assume this will cause the battery to indicate a temperature issue to the BMS, which in turn will trigger charge disconnect no matter whether temperature is too high or too low. Can anybody confirm this? For BMS 12/200, does this then disable charging via the LB port too?


stefancs asked
stefancs answered ·

3 Answers

Phoenix Inverter and c-pap causing led lights to blink.

I recently bought a Phoenix 48-250 inverter. When I plug in my wife's c-pap, the led lights blink and when I look at the output voltage on VE.Direct, it is jumping all over the place. I am not overloading it. It just doesn't like the c-pap. The c-pap has a transformer that changes from 120v ac 1.4amps to 12.8dc 4.5 amps. Any suggestions?

Thanks Ed

upnorthman asked
upnorthman commented ·

2 Answers

Multiplus firmware update problem

We have Multiplus 2612206. Trying to update to 2612431.

1. I have run VEConfigure to backup assistants and the settings.

2. I disconnect our CCGX and BVM700 by unplugging the RJ45 cable from the Multiplus.

3. Multiplus is on, inverting, the MK3 interface is not connected to Multiplus but is connected to laptop.

4. I run VEFlash, select firmware file 2612431.vff, assign correct port.

5. 'Connect part 1', I turn off the Multiplus by disconnecting the battery, connect the MK3 interface to the Multiplus RJ45 socket.

6. 'Connect part 2', I reconnect the battery to the Multiplus.

7. All LEDs on the Multiplus are now lit. Not sure what this signifies.

8. Cannot proceed to next step in the flasher.

william asked
william answered ·

4 Answers

Different solar panels for short periods?

On my yacht (Dragonfly Tri) I currently have a Sunware 40w panel that is connected through a FOx-150 PWM controller. This is fine for battery maintenance, however, when sailing and using autopilot, electronics and the family charging every phone/tablet they can lay their hands on, I am consuming the battery (two 55Ah Optima blue tops) and not getting the charge time. This is especially true in the winter months.

I am planning to have a 100w panel that I can connect into the system when sailing to provide additional power. Since I am a tri I have plenty of space to fix on the trampolines and will connect through a socket installed in the coach roof.

I have bought an MPPT 75/10 controller, and ideally, I would like to replace the Fox-150 and wire the panels in parallel. The FAQ said not to mix panels though so want advice on best way to proceed.

I can leave the FOX in place and wire the 100w panel through the Victron, although I think I will get better value of having the MPPT controller connected all the time. Or, as this will not be connected all the time, and only when I am on the boat, can I just connect in parallel through the Victron without the sky falling in.

Thanks, Mike

flameskimmer asked
flameskimmer commented ·

4 Answers

What is the difference between Single phase ESS in a three-phase system and Three-phase ESS?

What is the difference between Single phase ESS in a three-phase system and Three-phase ESS?

samgeorge123 asked
mvader (Victron Energy) commented ·

1 Answer

Venus VRM Security questions

What are the appropriate Remote Console settings to have a secure connection between VRM and the Venus when using the VRM Remote Console feature? Should I set the "Use Secure Connection option" to HTTPS? If so, is it important to use the VRM password option?

I currently have the HTTPS option selected and noticed that my router is not displaying the MAC address of the Victron Connection. It's Blank. Why is that? I currently connected using the Venus internal WIFI instead of a USB WIFI.

kdrvsolar asked
Guy Stewart (Victron Community Manager) edited ·

2 Answers

100/20 or 100/30 controller?

I am contemplating the 100/20 or the 100/30 charge controller. The 100/20 has some built-in protections, which the 100/30 does not. How practical are those protections and can they be easily added to the 100/30 charge controller?

Thank you

kleszczewo asked
Guy Stewart (Victron Community Manager) converted comment to answer ·

1 Answer

Clearing lynx ion bms history removes SOC information

I just cleared the Lynx Ion BMS History using my CCGX and to my surprise it also removed the SOC information. Is this the normal behavior? If so, it would be nice if their was a warning in the documentation. I wanted to set a new baseline for temps, voltage, charging, and discharging.



Pat Davitt asked
Guy Stewart (Victron Community Manager) edited ·

1 Answer

Charging Narada LCSS (lead carbon super capacitor) batteries with an AC coupled MultiPlus


I'd like some advice how I can make sure that the MultiPlus is programmed correctly for the Narada LCSC (Lead Carbon Super Capacitor) batteries. I've derived the two columns for the MultiPlus in the table below from the graph in the MultiPlus manual. The voltages for the batteries are derived from tables in the Narada manual.

The temperature compensation of the MultiPlus (currently) cannot be changed but it seems the differences (primarily at the lower and higher ends of the temperature spectrum) are significant. So far, the batteries have never reached temperatures above 25 deg/C so I'm not too worried about the higher temperatures. But the batteries surely drop to below 10 deg/C at times in the winter. What can be done to match the MultiPlus to these batteries?

My 2nd question is about the effect of ticking Storage box on the charging curve. In a fully off grid situation, the batteries never get "stored", they are in active use every day of the year. Hence I've disabled "Storage". I did notice a difference in the graphs though, which I would not expect. Why would the charging algorithm be different for the "non storage time" as well (as for the time the batteries are stored)? And am I correct in assuming that the "Repeated Absorption Time", "Repeated Absorption Interval" and "Max Absorption Time" do not apply when Storage is disabled?



A1 B D E F G H I J K
3 Temp (deg/C) Absorb Float
Absorb Delta Delta formula Float Delta Delta formula

5 <=10 58.80 56.40
56.40 -0.60 (G5-G8)-(D5-D8) 54.60 -1.28 (J5-J8)-(E5-E8)
6 15 58.00 56.00
56.40 0.20 (G6-G8)-(D6-D8) 54.60 -0.88 (J6-J8)-(E6-E8)
7 20 57.60 55.20
55.80 0.00 (G7-G8)-(D7-D8) 54.24 -0.44 (J7-J8)-(E7-E8)
8 25 57.00 54.40
55.20 0.00
53.88 0.00
9 30 56.40 54.00
54.60 0.20 (G8-G9)-(D9-D10) 53.52 -0.04 (J8-J9)-(E8-E9)
10 35 56.00 53.60
54.00 0.20 (G8-G10)-(D8-D10) 53.16 -0.08 (J8-J10)-(E8-E10)
11 40 55.20 52.80
53.40 0.00 (G8-G11)-(D8-D11) 52.80 -0.52 (J8-J11)-(E8-E11)
12 45 54.80 52.00
53.40 -0.40 (G8-G11)-(D8-D11) 52.80 -1.32 (J8-J12)-(E8-E12)
13 >=50 48.00 48.00
53.40 -5.00 (G8-G13)-(D12-D13) 52.80 -5.32 (J8-J13)-(E8-E13)

jbakuwel asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

LifeP04 & IP22. Documentation shows 4.2 absorption, requires 4.6 for full charge

Hi All,

After looking through all documentation for the Blue chargers, Lithium mode sets absorption at 4.2, which is not configurable unlike the MPPT solar chargers. Using a Renogy 170ah LifeP04 batter, and Renogy's documentation states 14.6.

My question is - should I be concerned that the battery will never be fully charged considering that the absorption phase stops at 14.2?

Adding to this, my BVM states that the maximum voltage detected is 13.7. Why does this not reconcile with the reading on the charger?

Thank you!

mduncan asked
klaus-pedersen answered ·

3 Answers

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