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Hello all. Found this forum after stumbling on Will's youtube channel. Currently planning a DC system upgrade for my new-to-me Grand Design 268BH and thought I would start to talk out a plan. My new 5th wheel has the horrendous Schwintek slide controller on it, and DC voltage brown out is...

I hear you, and I agree that the charger *should* not do that. I'm not disputing specification philosophy :-) I ended up calling WFCO and described my issue to them. They said that what I saw was not contrary to how that charger was designed to operate. That charger applied 13.6V to the...

Yup. This. Hoping that my RV converter supports "LFP" batteries. Otherwise, throw a Progressive Dynamics converter into the fray.

OK... I think the consensus is that I am definitely over-worrying, and I can simply ignore this. Thank you for the input!

Thanks... I'm rebuilding the wiring and the battery system. Relocating the batteries to behind a panel in the pass through. The batteries will be approximately 3' from the charger, connected through a bus bar and #4 pure copper wire I got from Windy Nation. There will be a MPPT solar...

Yup. Having worked in semiconductor security vending to the USG for 12 years at varied classified levels, I know things that I can not un-know. Are you truly that naive?

And BTW, I can't rule out that both of my batteries are acting in a way I consider oddly. I started another thread about BMS operation. I'm thinking that neither of my batteries charge to a SoC which would reflect more than a 13.2V resting voltage. So what happened with that WFCO was that at...

Li Time 12V 100Ah trolling motor batteries (with cold shutoff) currently on sale for $279 ea (if you care to DIY to 48V :-) )

^^^^ Hmmmmmmmm. Unfortunately what I am seeing on both of my batteries, is that when I apply 14.38V, I see an initial charging current of 55A, which quickly drops. Once it hits 3A, the change in charging current slows down, but still dropping. Then it hits 1.4A, and immediately goes to zero...

OK.. So draw down test on Batt 2 concluded with 100Ah drain. Voltage was at 11.05V and dropping fast. I pulled the load off, let the battery settle, and put a small 1.75A load on. The battery showed 11.3V. I'm happy with that capacity. I'm still using my PD9360V to charge, but I'm pulling...

I've got a WFCO WF-9855 (NOT the AD model that auto detects. Thanks, Grand Design!) Oddly my buddy has this same model, and it keeps his 4x 100Ah SOC LFPs fully charged on shore power. I note that this converter does bulk charging at 14.4V, so maybe (?) its on the hairy edge of being...

Cripes... do any of the China battery folks do any inbound marketing work before designing their batteries / BMS units? Li Time 100Ah trolling motor batteries I first started with a pair of Li Time trolling motor batteries. I saw Will's video on youtube and thought the batteries looked great...

I found my 9855 to discharge the battery. I ran a bench test over the course of about 3 days. I don't have a data logger, so I would go out and check the voltage at the terminals every few hours or so. For the first ~two days, the voltage ranged from 13.59V to 13.7V. After the first 44 hours...

Hmmm. Ok. I've been scouring the web attempting to self educate on BMS and LiFePo4 batteries for a day now. I'm a little more up the learning curve. I really don't care about fastest rate of charge, as long as I can reasonably "recharge" (90%?) two 100AH batteries off shore power within 12...

Can you point me to a thread or URL that discusses the operation of a BMS? I'm wondering if the majority of them operate similarly; I would bet there are subtle differences. I'm particularly interested in the operation of the Li Time BMS in their 100AH TM battery. (Yeah, i know... that is...

Yup. I was being lazy :-)

Side issue... I just talked to WFCO as the new 9855-AD converter I ordered off of Amazon turned out to be a fake Chinese copy. (Which is why I'm trying to figure out what my new options are). While I was on the phone with the customer service guy, I asked him about charging profiles. He...

My two batteries for my 5th wheel upgrade are here... and I have to say that it was almost disconcerting to find how light they are! Quite a bit of the rest should be here by the end of the week : 2pcs Li Time 100Ah trolling batteries : Check! 1 - Victron BMV712 monitor-shunt 1 - Victron...

It uses the house battery.

Thanks... I'm going to switch over to my BMS question thread, as I'm starting to push my own thread drift :-)

This is for shore power charging two Li Time 12V 100AH batteries wired in parallel in my RV. I'm trying to determine if I should upgrade my WFCO 9855 charger to a lithium compatible unit. My WFCO initially charges at 13.6V. I don't know if it folds back after bulk charging is done. I'm...

Yes... 12V only. We've boondocked for about 30 years and have never missed AC power. Who knows. Perhaps an inverter is in my future, but not for now. I don't know yet on the panels. I have a single 190W Mono panel that I have used for about 10years. It did a fine job keeping my two golf...

OK. Here's where my confusion comes from. I have recently purchased three Li Time Batteries. All LiFePo4 batts. (As a side note, I used to design power supplies and battery chargers for NiCad marine application stuff a long time ago. I am trying to not let my experience get in the way of...

I'm upgrading my 5th wheel I use for for boondocking. No inverter included in the build at this time. Two 100Ah Li Time batteries on the way. I'm picking through bits and pieces now, trying to get the rest of the core elements. If you have any preferences or advice on the below needs (I...

I'm going to do a complete discharge on the battery I have on the bench today. I don't have a low amp charger, so I will likely charge it with what I have for now and monitor the Ah charge it takes. I need to debug / setup my Victron smart shunt. It appears to want to reset the meter every...

Interesting! That would definitely be a big difference between the higher end batteries and the lower. From what I can tell, the Li Time trolling batts have zero ability to access the BMS data. My hunch is that I will probably only put 20-30 use cycles on my batteries annually, and after...

Ok.. I overworry things. I'm in the process of researching a conversion for my 5th wheel. I tow with a F250 2019 diesel. I've read that if you leave your trailer connected to the truck electrical, this can cause the lithiums to discharge into the truck when the truck is not running. I note...

Thanks. I want to characterize each battery first, to make sure that the capacities are relatively equal. Then I'll charge them individually. Great idea using a load while charging to control speed of charge. Then put them in parallel and repeat the characterization test. Dang. Being OCD...

Nope. Look up the word ballasting.

I don't want to play with it. But I especially don't want other people to play with it. I just want to lock it down and disable blutooth.