What voltage to use for dvcc “limit managed battery charge voltage” charging parallel epoch b12460

Been wrestling with this one on my own tiny house setup and figured it's worth opening up for discussion here.

Running two Epoch B12460s in parallel through Victron DVCC, and I've been experimenting with the "Limit Managed Battery Charge Voltage" setting. Currently sitting at 14.2V, but I've seen some folk dropping it as low as 13.8V–13.9V to reduce stress on the cells long-term.

Here's the thing that's nagging at me — with multiple MPPTs in the mix (I've got a pair of Victron SmartSolar 100/30s), the total harvested power seems noticeably constrained when I push that voltage ceiling down. It almost feels like the MPPTs are fighting each other for headroom. Has anyone else noticed the combined output looking artificially throttled compared to what each unit can independently produce?

A few questions I'd genuinely like to work through with people here:

• What voltage are others settling on for parallel LiFePO4 packs with DVCC active?
• Is there a meaningful longevity benefit to capping below 14.2V, or is the Epoch BMS already handling that internally?
• Could restricting charge voltage actually cause unequal current sharing across parallel packs?

The Epoch BMS is reasonably well-regarded, but I'm not convinced it communicates granularly enough with Victron's DVCC to make aggressive voltage limiting worthwhile. Might just be adding a second layer of restriction on top of what the BMS is already doing natively.

Interested to hear from anyone running a similar parallel configuration — especially if you've done any proper logging through VRM to compare harvest totals at different voltage ceilings.

For parallel Epoch B12460s I'd set the DVCC charge voltage limit to 14.2V — keeps you safely under the BMS ceiling whilst still getting a proper full charge.

The Epochs tolerate 14.6V but running parallel cells means any slight imbalance gets amplified, so headroom matters. 14.2V is the sweet spot most LiFePO4 setups land on anyway.

Few things worth checking:

• Make sure DVCC SVS (shared voltage sense) is enabled
• Let the BMS handle the actual cutoff rather than relying solely on DVCC
• Check both batteries are genuinely balancing — parallel doesn't guarantee it

I run something similar on my garden office setup with Fogstar cells and landed on 14.2V after some trial and error. Victron's DVCC docs are decent but vague on parallel configs specifically.

What charger are you running them through?

@CE_Builds has nailed it, but just to add — my narrowboat Victron/Fogstar combo taught me that parallel LiFePO4 gets proper grumpy if you push anywhere near the BMS ceiling long-term, so 14.2V is the sweet spot between "fully charged" and "warranty voided in spectacular fashion."

Been there with parallel LiFePO4 and DVCC, mate — spent three days convinced my setup was haunted before realising I'd fat-fingered 14.6V instead of 14.2V. Batteries were not amused. Neither was my emergency backup inverter when it kicked in at 2am.

One thing nobody's mentioned:

14.2V is the magic number until your BMS has a sulk and ghosts the whole system at 2am — ask me how I know from my narrowboat days 🕯️

Ooh this is really timely — just commissioning a parallel LiFePO4 setup on my boat and DVCC has been baffling me too!

Quick question for the thread: does anyone know whether the "limit managed battery charge voltage" in DVCC actually overrides what the Epoch BMS is requesting via comms, or does it just cap the absolute ceiling as a failsafe?

I've been unsure whether to trust the BMS to negotiate directly with my Victron kit or whether I should be manually dialling that value in regardless. @DevonNomad your 2am horror story has me slightly nervous about leaving it to chance!

Also — are people finding the sweet spot differs when cells are top-balanced vs freshly paired? My two units arrived at slightly different states of charge which I'm wondering might be relevant here.