Thinking about getting Dyness, Huawei or GoodWe HV (200-400VDC) batteries, mainly because our system is installed near living area and 48V inverter makes a lot of noise. My understanding is that all 48V inverters will make such noise because of heat generated from inefficiencies. That's why I'm looking into HV Inverter & batteries. Price not being an issue, my only concern is the safety factor with respect to HVDC batteries.

Assuming battery is properly grounded, is there is a chance of battery chassis/cabinet still becoming energised and hurting someone? OR would grounding ensure that the battery's built-in fail-safe mechanism kicks in and it shuts off/blows internal fuse etc? Is there a GFCI/RCD type breaker for batteries as well?

Can't answer, but would suggest to look also at Goodwe for 48V inverters, since they are supposed to have fan-less operation on some models. Perhaps some Goodwe owners can comment.

Just now, GreenFields said:

Can't answer, but would suggest to look also at Goodwe for 48V inverters, since they are supposed to have fan-less operation on some models. Perhaps some Goodwe owners can comment.

There are fanless 48V inverters but those are smaller 1-Phase models, upto 8KW. I need 3-Phase 12KW inverter.

Edited July 24, 2025Jul 24 by LionKing

4 hours ago, LionKing said:

Assuming battery is properly grounded, is there is a chance of battery chassis/cabinet still becoming energised and hurting someone? OR would grounding ensure that the battery's built-in fail-safe mechanism kicks in and it shuts off/blows internal fuse etc? Is there a GFCI/RCD type breaker for batteries as well?

I am not aware of batteries monitoring tracking to the case. Your biggest risk with a battery is probably hot connections. Higher voltage DC batteries should be safer.

I thought all batteries are supposed to be outside living quarters/outside? Isnt this a COC requirement

7 hours ago, Denns said:

I thought all batteries are supposed to be outside living quarters/outside? Isnt this a COC requirement

No such requirement in our region. The battery is out of sight so normally no one comes close to it, but I'm just trying to foresee an unfortunate outcome with a HV battery system. If 48V systems weren't noisy, I would have just gone with it. Also, it seems like battery companies are now pushing more HV products as well, I guess the technology has matured enough over the years.

17 hours ago, Denns said:

I thought all batteries are supposed to be outside living quarters/outside? Isnt this a COC requirement

My PV system is COCed and registered with City Power. Battery is inside. No problems.

2 hours ago, Bobster. said:

My PV system is COCed and registered with City Power. Battery is inside. No problems.

I was about to start the process of moving the batteries outside. I might still do it but maybe getting a Certo battery cabinet and keeping them indoors would be a much simpler and less expensive option for me. I already have a fireball and firemat etc as protection.

3 hours ago, Denns said:

I already have a fireball and firemat etc as protection.

Get LiFePo cells and a good BMS, otherwise you don't have effective protection.

11 hours ago, frivan said:

Get LiFePo cells and a good BMS, otherwise you don't have effective protection.

AFAIK fireballs explicitly state that they're not for lithium batteries. You need a special fire extinguisher for that (pricey) and a special kind of blanket as well, class D equipment. Fireball is class C. Conventional firefighting equipment can just make a lithium fire worse.

Edited July 26, 2025Jul 26 by BobTheDinosaur

19 hours ago, Denns said:

. I already have a fireball and firemat etc as protection.

Flameblock Lithium Black fire extinguisher is suitable for extinguishing fires in LiFePO4 batteries. It's specifically designed to handle lithium-ion battery fires. Flameblock Lithium Black is not a generic fire extinguisher. It's a specifically formulated agent designed to tackle the unique challenges of lithium-ion battery fires, including LiFePO4. 

And include smoke detectors above your batteries with remote reporting so you are warned in advanced.

I have GEL batteries. The fireball is mainly to kill an open flame from something other than thd batteries when they catch fire.

Also with lithium, I watched tests done and Lipo cells don’t catch fire, it’s the materials around it that does.

The smoke detector is something I already ordered but I am building an enclosure made of brick with ventilation to put the batteries outside with a small shed. The smoke detector will only be for the inverter and so will the fireball. Those will be inside my house.

Yep, I confirmed it. Lipo does not burn with an open flame. I think you guys misunderstood the specs for the fireball. It won’t stop the cells from going into thermal runaway, but it will stop everything that the heat from the cells cause to burn (RIP to those that use wood etc as enclosures for their batteries). This can be your wooden cupboards, ceiling etc. only the immediate area around the cells won’t be put off until the heat from the cells dissipates.

A fireball will save your home from burning. I’m still putting my batteries outside as it makes the install much neater for my setup. When I’m done building I’ll post pics.