memilanuk
New Member
- Joined
- Apr 21, 2021
- Messages
- 125
Looking at building my first DIY LFP battery, possibly a 12v 4S 280ah, to replace my pair of 12v FLA group 24s (guesstimate of 85ah each) in my slide-in truck camper.
One of the things I need to be able to support is starting current for the onboard generator. The factory-supplied wiring feeds the generator starter directly from the battery terminals using #4 wire. Last night I dusted off my old Fluke 36 clamp-on ammeter, put a fresh battery on it, set it to read max DC current, and put it on the positive cable going from the battery to the generator. Started the generator, and read a max instantaneous current of ~350 amps, for a second or two. Most of the rest of the time, the load will be pretty low - typical, from what I've read, for most solar systems.
I've started looking at the spec sheet for the Overkill BMS, and saw that it has a ~10 second delay for the over current trip, but I wasn't clear what level the instantaneous / short-circuit over current trip goes at? For that matter, I'm not particularly wedded to any one BMS at this point - would one of the Daly models be suitable for this use case?
One of the things I need to be able to support is starting current for the onboard generator. The factory-supplied wiring feeds the generator starter directly from the battery terminals using #4 wire. Last night I dusted off my old Fluke 36 clamp-on ammeter, put a fresh battery on it, set it to read max DC current, and put it on the positive cable going from the battery to the generator. Started the generator, and read a max instantaneous current of ~350 amps, for a second or two. Most of the rest of the time, the load will be pretty low - typical, from what I've read, for most solar systems.
I've started looking at the spec sheet for the Overkill BMS, and saw that it has a ~10 second delay for the over current trip, but I wasn't clear what level the instantaneous / short-circuit over current trip goes at? For that matter, I'm not particularly wedded to any one BMS at this point - would one of the Daly models be suitable for this use case?