Add solar hardware plan: Deye hybrid inverters + Gobel Power 271 kWh BESS

Includes open engineering checks: battery rack voltage vs Deye model
window, Gobel safety certifications, and peak-shaving-scale framing

README.md

@@ -177,6 +177,17 @@ at 10 bar / 180 °C) and the 250 kW cooling system.
 - A large rooftop/ground PV installation is planned. Northern Thailand's solar
   irradiance is favorable, and daytime-heavy production shifts align well with
   PV output.
+- The chosen hardware direction: multiple large **Deye** three-phase hybrid
+  inverters (30 to 80 kW class, parallelable up to 10 units) paired with a
+  **Gobel Power** high-voltage LiFePO4 battery stack at **271 kWh** (15
+  stacked 18 kWh packs, LFP 314 Ah cells, rated 8000+ cycles). Deye is an
+  officially supported protocol on the Gobel BMS, and Deye has established
+  Thai distribution. Two engineering checks are open: matching the battery
+  rack's DC voltage window to the specific Deye model (a full 15-pack rack
+  can exceed the 800 V window of the smaller Deye series), and obtaining
+  Gobel's safety certifications (not published) for a Thai commercial
+  install. At 271 kWh the stack is a peak-shaving and ride-through buffer,
+  not full off-grid autonomy, against loads like the 250 kW cooling system.
 - The machine load and cooling system are straightforward PV targets.
 - Steam is the open engineering question. Options under evaluation include an
   electric boiler (maximizes the solar share), a biomass boiler (locally

docs/suppliers/equipment-suppliers.md

@@ -139,7 +139,21 @@ Open: identify and qualify Thai/regional PVC compound producers.
 
 ## 8. Utilities and Site (customer-supplied around the machines)
 
-- Solar PV installation (large; sizing open until site selection)
+- Solar PV installation (large; panel and array sizing open until site
+  selection)
+- Solar inverters: multiple Deye three-phase HV hybrid units. Verified
+  series SUN-29.9/30/35/40/50K-SG01HP3 (battery window 160-800 V, up to 10
+  in parallel, IEC 61727/62116/62109 certified); larger SUN-60/70/75/80K
+  SG02HP3 series to be confirmed via datasheet. Thai distribution exists
+  (Solar Nicolo, solaris.co.th)
+- Battery storage: Gobel Power (Shenzhen, est. 2012) GP-SRA-HV314 HV rack
+  BESS, 271 kWh = 15 stacked 18 kWh packs (LFP 314 Ah, 1P18S), DC 225-985 V,
+  8000+ cycles, ~135 kW continuous discharge at 0.5P, CAN/RS485 with "Deye
+  CAN HV" protocol support. Listed USD 39,900-58,000, 50-60 day lead from
+  China. Open checks: rack voltage vs. chosen Deye model's battery window
+  (full 15-pack rack can exceed 800 V), safety certifications
+  (UN38.3, IEC 62619, CE) not published, no performance warranty published,
+  no Thai distributor
 - Steam generation (electric, biomass, or solar-thermal assist under
   evaluation; Deepgrooves NL runs presses on wood-fired biomass boilers as a
   precedent)