Converting a 24 volt Blue nova battery to 48 volt

[Hendrik 22308]

Good day

Can you convert a 24 volt blue nova battery (BN26V-62-16k) to 48 volt.

I checked the cells on the inside an it can be done by changing the configuration of the busbars but I am not sure about the monitoring system. Currently it is 6 volt dc per segment (x4 to give the 24 volt). The monitoring system are currently measuring the 3.2 volt cells.

Thanks

 

[Speedster]

Is your insurance up to date?

 

[Steamy Tom]

What you do is buy 2 if they can be series'd... The bms is designed for a 24v system don't be a clown

 

[TheChamp]

It's forbidden by law.

 

[Gnome]

The BMS will have a voltage rating and it will also be configured for a certain configuration. For example if it is LiFePO₄, it will likely be something like 8s2p (8 series 2 parallel). If you change that the BMS will simply cut out because WTF is happening. So you'll need a new BMS and they are fairly costly.

Running without a BMS for Lithium batteries is not safe (and not just for unlikely events, it is critical to the operation of the battery). The BMS ensures the cells are charged to the same state of charge and monitors temperature. The BMS also prevents over and under charging. Lithium batteries, unlike lead acid, will accept and provide charge no matter what (Peukert's law isn't applicable to Lithium). What that means is, if you provide too much current, too high a voltage, drain the battery too much, drain at too high a current, one of the cells isn't balanced, etc. The Lithium cell will just keep going, but because it is outside its specification, it heats up rapidly until it swells up and vents gas (LiFePO₄ case) or catches fire (other common Lithium chemistries). The gas vented by lithium batteries is super toxic (again unlike lead acid which spews out a much more "tolerable" H₂SO₄, Lithium batteries would spew out HF gas, it'll be a lovely experience). Also when it does catch fire, it burns MUCH hotter than a typical fire and it is nearly impossible to put out.

 

[Pineapple Smurf]

Basically your battery is gonna stop immediately in it's tracks if you try and modify it at home using the MyBroadBand Forum as your guide on how to modify the BMS.
Hopefully with no explosion

 

[kolaval]

Duh, just multiply by 2

 

[itareanlnotani]

Easiest is to buy 2.

Longer answer - yes it is possible, but I wouldn't recommend it.
Otherwise you'll need to remove the old BMS, rewire batteries for 48v (assuming you have enough internal batteries to get to that voltage), install a new BMS set to 48v and wire that in.

Assuming its 16 in series internally - this could potentially work https://lithiumbatteriessa.co.za/co...s-120a-8s-24v-lifepo4-lithium-ion-phosphate-1

I do not recommend you do so though.

Seems like a bit of unnecessary work imho, buy another battery. More storage is always good to have.

 

[Gnome]

Assuming its 16 in series internally - this could potentially work https://lithiumbatteriessa.co.za/co...s-120a-8s-24v-lifepo4-lithium-ion-phosphate-1

That BMS sucks. Also it only works for LiFePO₄. No guarantee that is the chemistry used in the Blue Nova battery.

 

[RonSwanson]

Easiest is to buy 2.

Longer answer - yes it is possible, but I wouldn't recommend it.
Otherwise you'll need to remove the old BMS, rewire batteries for 48v (assuming you have enough internal batteries to get to that voltage), install a new BMS set to 48v and wire that in.

Assuming its 16 in series internally - this could potentially work https://lithiumbatteriessa.co.za/co...s-120a-8s-24v-lifepo4-lithium-ion-phosphate-1

I do not recommend you do so though.

Seems like a bit of unnecessary work imho, buy another battery. More storage is always good to have.

I would assume that the 16k denotes 16kWh (assuming that it adopts BlueNova's model convention of V-Ah-kWh). So 26V, 62Ah, 16kWh, not even listed on the SA BlueNova site, so either a grey import or discontinued.

Technically, anything is possible, agreed, but economically highly improbable that the OP has the budget to replace a 330 plus amp BMS, let alone the skills to perform the equivalent of open-heart surgery safely on a volatile storage system, and then monitor and run it.

Agreed that he should flog it to a 24V system owner and get something decent.

 

[itareanlnotani]

That BMS sucks. Also it only works for LiFePO₄. No guarantee that is the chemistry used in the Blue Nova battery.

Blue Nova are LiFePo4, so they are the correct chemistry.

Again, I'm not condoning doing it.

 

[Gnome]

I would assume that the 16k denotes 16kWh

That is a HUGE capacity, you sure it doesn't mean 1.6kWh. 16kWh would be the equivalent of 3 of these

 

[RonSwanson]

That is a HUGE capacity

correct

 

[RonSwanson]

Basically your battery is gonna stop immediately in it's tracks if you try and modify it at home using the MyBroadBand Forum as your guide on how to modify the BMS.
Hopefully with no explosion

The most of us, sadly yes.
But there are some very clever forumites here, with hardcore practical experience.
@IguBu
@Gnome
amongst others

 

[Speedster]

That is a HUGE capacity, you sure it doesn't mean 1.6kWh. 16kWh would be the equivalent of 3 of these

BN model numbers are V-Ah-kWh, so 1.6kWh sounds about right.

 

[Pineapple Smurf]

The most of us, sadly yes.
But there are some very clever forumites here, with hardcore practical experience.
@IguBu
@Gnome
amongst others

The battery is still going to get hurt as every battery is designed to only give out so many amps per second and that is it.
OP is wanting to use a 24 volt battery on its own to drive a 48v array and sure enough it will work if BMS is modified but when OP starts achieving 10 000 Watts or whatever the inverter can push out that poor battery all on its lonesome is gonna start crying

 

[itareanlnotani]

LFP should be able to do 1C without issue, so would be able to output its full capacity in an hour.

I wouldn't go below maybe 20% charge (>80% discharge), but the BMS should handle that automagically.

BN26V-62-16 - assuming thats 1.6KW capacity, you should be able to pull 1.5KWish sustained for most of an hour.

 

[upup]

voltage x 2 but amps divide by 2.

 

[P924]

Looks like it is actually the BN26V-620-16k.
Your best option is to contact Bluenova and ask if they can convert it for you. The BMS is their own design.

 

[Lupus]

Honestly, you buy another 24v battery and hook them up in series.