Fogstar Drift 100Ah vs Dakota Lithium — worth the price gap for a home backup setup?

I've been running a 400W rooftop array through a Victron SmartSolar MPPT 100/30 into a single Fogstar Drift 100Ah LiFePO4 for about eight months now, primarily as emergency backup for the house (sump pump, router, a few LED circuits). So far the Fogstar has been solid — the built-in BMS hasn't thrown a single fault, and the Victron integration via VE.Direct is clean. Picked it up for around £180 delivered, which felt reasonable.

I'm now looking to add a second 100Ah battery to double the capacity to ~2kWh usable, and I keep seeing Dakota Lithium come up in recommendations. Their 100Ah is sitting at roughly £350–£380 at the moment, so nearly double the Fogstar price. The claimed low-temperature performance is the main selling point I can see — rated down to -20°C — but my batteries are in a dry internal cupboard so that's probably irrelevant for my use case.

The bit I'm genuinely uncertain about is whether mixing a second Fogstar Drift with my existing one is straightforward in parallel. I've read conflicting things about parallel LiFePO4 banks — some people say match age and capacity exactly, others say it's fine if the BMS specs align. Both units share the same BMS cut-off voltages (2.5V low, 3.65V high per cell) so on paper it looks fine, but I'd rather hear from people who've actually done it.

Has anyone run two Fogstar Drifts in parallel long-term, or made the case for spending the extra on a premium brand for a static home backup setup rather than a van or off-grid cabin?

SuffolkOffGrid | Posts: 847 | Location: Suffolk

Eight months is decent real-world time, @CrafterDream. I've had a Drift 100Ah paired with almost identical kit for coming up on two years now and honestly can't fault it. The BMS has handled some pretty aggressive charging cycles without complaint.

The Dakota premium always struck me as paying largely for the American branding once you dig into the actual cell specs. Both are using decent LiFePO4 chemistry — the Fogstar's just more honestly priced for what it is.

For a home backup role specifically, I'd say the Drift is entirely sufficient. You're not hammering it with constant daily cycling like a full off-grid setup would, so longevity concerns are fairly minimal either way.

What's your typical load during outages? Might be worth considering whether a second Drift in parallel makes more sense than upgrading to a pricier single unit.

BatteryAlan | Posts: 1,203 | Location: Array

Dakota Lithium charge you a premium largely for the "made in USA" marketing whilst the cells inside are still coming from the same Far East supply chain as the Fogstar — your Drift's got a solid BMS and the Victron plays nicely with it via the absorption/float profile, so unless you're running parallel strings where cell-matching genuinely matters, the price gap is basically funding someone's branding budget rather than buying you extra capacity or cycle life.

StormyHermit | Posts: 847 | Location: Yorkshire Dales

@CrafterDream eight months is a decent trial period — what's your actual depth of discharge looking like day-to-day? That'll matter more than brand loyalty for longevity.

I've had a Drift 100Ah paired with almost identical kit (Victron 100/30) for coming up two years now and it's been rock solid. For a sump pump backup scenario you're unlikely to be hammering it hard, which frankly suits the Fogstar well.

Dakota's warranty support from the UK can be a bit of a faff compared to Fogstar's domestic customer service — worth factoring in beyond the sticker price. Unless you're planning to expand significantly or need their low-temperature performance specifically, I'd struggle to justify the premium for your described use case.

What's triggering the reconsideration — any specific behaviour you've noticed?

MikeCross | Posts: 312 | Location: Array

Got a Drift 100Ah in my shepherd's hut build — same Victron MPPT pairing actually. 8 months in myself and zero complaints. BMS handles my occasional heavy draw fine.

For home backup specifically, I'd honestly stack two Drift units before even considering Dakota at that price gap. Same usable capacity, keeping money in your pocket for a second MPPT or decent cabling.

Dakota's warranty support from the UK is also a bit of a grey area — had a mate chase them for weeks over a warranty query. Fogstar's UK-based so that friction just isn't there.

PanelBuff | Posts: 2,156 | Location: Array

Got the Drift 100Ah in all three of my builds — narrowboat, motorhome, and the cabin. Eight months is nothing, these cells should be good for 2,000+ cycles if you're not hammering them below 20%.

For home backup specifically, the Dakota premium makes even less sense to me. You're not dealing with vibration or marine moisture the same way, so the rugged casing argument falls flat.

One thing worth checking @CrafterDream — what's your MPPT absorption voltage set to? I run mine at 3.45V/cell (13.8V for a 12V bank) on the Victron. Fogstar's own docs back this up and it keeps the BMS happy long-term.

If you eventually want to expand, the Drift cells play nicely in parallel too. Done it on the boat with four of them, no dramas.