UK, Eco-worthy 48V, 100Ah server rack battery £720 = $1,000 so not much cheaper than Pylontech.
…wait, I had assumed that I’d have to toss my 51.2v 100A golf cart battery when I upgraded to 16-cell 51.2v smart batteries. Assuming that my golf cart battery is still in good shape, are you saying that it is possible (and practical) for me to continue using it along with the 51.2v smart batteries? I was under the impression that this was highly inadvisable.
If you’re in the US, you could also try Pytes batteries, we have systems with their V5 and V12 models ( 51.2V 100Ah and 230Ah). They have prismatic cells, 8,000 cycles and they’re on the Victron proved compatibility list
I don’t know the brand, but as long as your new battery has the same voltage range as the old one, you can simply connect it in parallel. You’d have to manually monitor the battery that’s not talking to your victron system, checking for cell imbalance and such by looking into the BMS directly, but some might regard even this step optional. If there are problems with the battery (high cell imbalance) and the BMS fails to disconnect the charge MOSFET, the charger won’t know and overload the battery, which might become dangerous. Still, this needs two errors to occur simultaneously.
Wow! For that money you can buy a 32 kWh battery from NKON.nl with EVE MB31 cells, Seplos BMS with active balancer, built in fire extinguisher and heating.
China is scaling back its subsidies for solar modules and batteries, and is now focusing on achieving global dominance in the automotive sector as well. Just a week ago, this 32 kWh battery was available for €700 less.
they
bit momentary not available - since months
Did anybody really get one of this NKON Batteries? Did they already sell some?
Yes, on Dutch / Belgium fora you see them. I’ve installed 2 (one at home and one at friends place). Colleague bought the 16 kwh version. But all end 2025, beginning 2026
I’ve been using several different types, sizes, and generations of SOK batteries for years and I’ve been pleased with them. Will Prowse rated them highly, most of their current range has Victron compatible BMS comms, and the prices are good.
Then buy two of the 16 kWh models. They are available.
Meanwhile there are some makes of 32 kWh DIY boxes available, either for 32 pieces of EVE MB31 or 16 pieces of EVE MB56 cells. But it is still difficult to get EVE MB56 cells, and mostly they are more expensive than two MB31.
88kWh custom build (marine propulsion) batteries based on EV lithium modules. Running pre-delivery balance, capacity, match and cycle test programs on a Victron based DESS system.
If we could please keep to the OP’s subject and not drift too far off course. Thanks.
I have a 16kWh Fogstar battery (UK supplier). These are EVE MB31 cells with Seplos v3 BMS and active balancer in a Seplos-Mason box. So pretty-much the same as the Nkon.nl batteries. They have heated and unheated variants. The battery/BMS has Canbus and RS485 comms, and will speak numerous protocols. EVE cells spec is for 8000 cycles up to 0.5C. We shall see if it’s true or not.
I’ve been very happy with mine, and they work fine with Victron MUltiplus II, and are excellent value. (£1700 for 16kWh when I bought, £1800 now, £1950 fully assembled). But there are some wrinkles to be aware of.
- The Seplos BMS 3 does not follow Victron’s requirements on using voltage limits rather than current limits to control charging rates when the battery is full, so it’s safe, but doesn’t work properly with DVCC if you want to export excess solar to the grid with a full pack. This will be the same for any battery using the Seplos v3 BMS.
- The original Seplos active balancer did not work well and has been replaced with a JK device in new batteries. It can easily be replaced in older packs too. I have done this and the new one does indeed work much better.
There is no “subsidie” on batterys at all in NL
the price you would have to pay in your country for them is unbelievable! I would go for something different too…
(I have 4 US5000’s)
EVE MB31 Grade A cells are rated for 8000 cycles. The Fogstar battery probably ist made of Grad A- cells.
I have a GobelPower 314Ah 16.2kWh battery with JK 200 BMS, coupled to a Multiplus II 5000/48 with 12 Aiko 470W panels and Three Smart Solar 250/60 charge controllers charging it up, Cerbo GX doing its thing. It’s been in a year and still showing 100%SOH.
This is mostly a meaningless calculated metric, often not based on any reality and surely doesn’t show if any component is on the way out.
Changed dead, swollen cells in batteries all happily reporting 100% SOH.
Get 5 or more years under your belt and see if the battery behaves itself.
EcoWorthy was running sales and auctions on eBay, got 6 48V 100Ahs for a little over ~$4000…my first 48V EG4 battery was much more costly per battery even though it was the “cheapest” at the time.
Interesting. Thanks Mike. I am very interested in the Ecoworthy batteries and rack.