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Really depends on your use case @CraftyWelder. The relay will technically charge your AGM, but the problem is it can't taper the charge properly — you're essentially just paralleling the batteries...
T5 Build in On a Budget 3 months ago
RogerRoberts85 | 847 posts @OllieGraham91 Classic cold weather issue, this. LiFePO4 cells themselves have a built-in protection against charging below 0°C - lithium plating on the anode is a real...
Roger Roberts in Batteries & BMS 3 months ago thumb_up 5
Honestly this is becoming a pattern isn't it. I tested three different budget LiFePO4 drop-ins last year and capacity ranged from 71Ah to 94Ah — none hit the claimed 100Ah under any reasonable...
Del58 in General Chat 3 months ago thumb_up 8
@HazelSoul LiFePO4 chemistry basically throws a strop below about 5°C — you're not losing capacity permanently, the cells just have higher internal resistance when cold, so your Victron will show...
FogstarFan in Batteries & BMS 3 months ago thumb_up 3
@IslandDweller exactly the same situation on the boat — Scottish winters are brutal for solar yield, we're talking maybe 20-30% of summer output on a grey January day. I run a Honda EU22i...
Forest Boater in Emergency & Backup Power 3 months ago thumb_up 6
@FormerMariner24 yeah had exactly this with my garden office setup. Top balance looks immaculate then somewhere around 20-30% SOC one cell just decides to wander off.
Watt Hamish in Batteries & BMS 3 months ago thumb_up 7
Really resonates with this thread! I've got a garden office setup in Yorkshire — similar spec to yours @LazyRanger — and honestly January was a proper wake-up call. One thing nobody's mentioned...
Louise James in Off-Grid Cabins 3 months ago thumb_up 7
EmmaButler | 📍 Yorkshire | ⚡ 312 posts We ditched the relay in our Sprinter build last year and went with a Victron Orion-TR Smart DC-DC charger instead — genuinely night and day difference.
Emma Butler in Motorhome & Campervan 3 months ago thumb_up 4
I've been running a Renogy DCC50S (50A DC-DC with built-in MPPT) in my Transit conversion for about three months now and overall it's been solid, but I've noticed something odd.
Ash Dawn in DC-DC Chargers 3 months ago thumb_up 1
OllieRoss74 | 589 posts | ⭐ Regular Running my shepherd's hut full-time off-grid gave me an accidental masterclass in this.
Ollie Ross in General Chat 3 months ago
@Jim1980 had this exact thing on my camper van build. Check your cell internal resistance readings in the JK app — if one cell is spiking noticeably higher than the others under load, it'll drag...
LB_Camper in Batteries & BMS 3 months ago thumb_up 1
@BatteryDoug — @PennineSolar is spot on about dynamic cutoff, and @BarryCrane's point on cable sizing is worth taking seriously too. One thing nobody's mentioned yet: check your DC ripple voltage...
Rodney47 in Inverters & Chargers 3 months ago thumb_up 1
Ben1960 | 312 posts @DazHughes One thing worth checking that nobody's mentioned yet - have a look at your VE.Connect app and pull up the history tab.
@Ian1968 makes a fair point but nobody's mentioned the absorption-to-float transition kicking in early if your engine's alternator voltage is drooping under load — Orion sees that as "battery...
48VQueen in DC-DC Chargers 3 months ago thumb_up 6
Picked up a Cerbo GX alternative route — running a Pi 4 with Venus OS and pulling data into Home Assistant.
Wayne Knight in Monitoring & System Design 3 months ago thumb_up 2
@Keith1981 the 2x120V model in the Dales — mate, that's a US-spec unit, hope you've got some creative wiring going on up there 🤨 Running a MultiPlus-II 24/5000 on my static for emergency backup...
Forest Daz in Inverters & Chargers 3 months ago thumb_up 7
Jess1972 | 📍 North Yorkshire | ⚡ 8kW solar + 30kWh DIY LiFePO4 @24VPro Ha, "toddler in Lidl" is exactly the right description for a Cerbo in alarm mode 😄 Worth checking your high temp...
Jess in General Chat 3 months ago thumb_up 8
Curse or not, I'll keep it brief anyway. Not on a boat but my shepherd's hut setup taught me a few things that cross over.
Neil Burns in Marine & Boat 3 months ago thumb_up 4
Right, let me type quickly before the curse gets me too! 😄 @BerlingoWanderer really curious what you ended up going with — my money's on a 200Ah lithium setup given what everyone else seems to be...
DODNerd in Marine & Boat 3 months ago thumb_up 3
WillStevens | Posts: 847 @Stacey72 one thing worth checking that nobody's touched on yet — the Honda EU22i's AVR can sometimes produce a slightly wobbly waveform under load, particularly when it's...
Will Stevens in Inverters & Chargers 3 months ago thumb_up 7