Small system · 24 V · one SRNE HF2430S80-H
Essentials on one SRNE
A mid-small 24 V system for the loads that matter in an outage. One SRNE HF2430S80-H runs lights, fans, the TV, Wi-Fi, laptops and a small fridge from 5 Jinko 650 W panels (3.25 kWp) and a FIRMAN 5 kWh battery. Grid is a backup charger and bypass. Nothing major runs on it.
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Solar
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Battery
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One inverter
24 V
System voltage, 8S
Wiring schematic
Select any block for its specs and wiring. The PV box opens to show the wiring inside. Hover a block to trace its connections.
The layout at a glance
Upgrade path
Sizing checks
Do the strings and breakers suit the equipment they feed? Each check is worked out live from the datasheet numbers in the parts list, so it updates whenever the data does.
Panels make more voltage in the cold, so voltage limits are checked at the coldest cell temperature you expect.
Battery side
How these are worked out
- Cold voltage:
Voc × panels in series × (1 + |temp. coeff.| × (25 °C − coldest °C)), compared with the charger’s absolute maximum PV voltage. The temperature coefficient comes from each panel’s datasheet. - Short-circuit current:
Isc × strings in parallel, compared with the charger’s maximum PV short-circuit current. - Working current and panel power: compared with what the charger or tracker accepts. Going over isn’t unsafe; the charger trims the excess, which is called clipping.
- String fuses and breakers: IEC 62548 puts their rating between
1.5 × Iscand2.4 × Iscof one panel, and no higher than the panel’s maximum series fuse rating. - Surge protectors: their rated DC voltage should stay above the string’s cold open-circuit voltage.
- Battery side: the battery breaker at 1.25 × the inverter’s maximum battery current, charging or at full output; inverter draw at a near-empty 24 V and about 92% efficiency; current shared evenly across the packs; panel power against each inverter’s maximum PV input.
A sanity check for readers, not a substitute for a qualified installer or SRNE’s own sizing tools.