Installation was quick and efficient, and the system seems to manage small loads as promised, Web interface is clear, data is locally accessible to automated tools; expensive by the kWh.
Bought from Eco Partners for £2995 including installation and VAT (and continuing on-line services). The Enphase AC Battery is rated at ~1.1kWh usable capacity (reports 1240Wh at full, 0Wh at empty, as of 2018-08), ~260W maximum charge/discharge power, and the key undocumented minimum supported (ie trigger) load (so maximum 'leakage' import) of 5--15W, which is important where typical loads are small, eg overnight. (Best alternative known is Sonnen 8 or 9 at ~30W; 240W is not untypical.) LiFePO4 (lithium iron phosphate) / LFP (lithium ferrophosphate) chemistry AKA the non-exploding but slightly heavier type of lithium battery.
Size is 390 mm (W) x 325 mm (H) x 220 mm (D) without bracket. 25kg for the battery itself. A modular system allowing multiple battery packs to be added as needed, though would be bulky and expensive to cover typical household spiky loads such as washing machine (~2kW) or kettle (~3kW).
A single "Envoy-S Metered" has to be installed to manage one or more Battery units. The Envoy is small and acts as a hub to connect to the Internet and even serve stats locally. Security might be enhanced if Internet connectivity could be dropped entirely unless required. Envoy can accept details of local time-of-use static tariffs to optimise savings, but apparently not dynamic inputs or my algorithms using data accessible within the Envoy, to improve scheduling and system value.
Provides good live metering of grid import/export in reasonable agreement with supply meters, and also of PV generation. (Slightly underestimates imports, I think because of reconcilliation with 15-minute reporting blocks of batteries.)
In a forced remote 'upgrade' to Envoy system firmware, against my explicit instructions on file, broke many of my integrations and Enphase has refused to undo or mitigate the change as of ; my rating is thus reduced from 4.5 to 2 and currently I would not recommend Enphase product.
review.positiveNotes=fine control of import/export down to ~5W #review.positiveNotes=local JSON stats avaiable over LAN (at version D5.0.34) review.negativeNotes=forced remote 'upgrade' to system 2024-08 to version 7 against my explicit instructions broke many of my integrations and Enphase has refused to undo the change review.negativeNotes=local JSON stats no longer available at version 7 review.negativeNotes=no ability to instruct/inhibit charge or discharge on the fly over LAN review.datePublished=2018-08-14 #review.datePublished=2024-01-06 review.reviewRating.type=Rating # Original 2018-08-14? #review.reviewRating.ratingValue=4.5 # DHD20250106 review.reviewRating.ratingValue=2 review.reviewRating.bestRating=5 offers.type=Offer offers.availability=InStock offers.url=https://ecopartnersuk.com/ offers.price=2995 offers.priceCurrency=GBP offers.priceValidUntil=2018-07-18