diff --git a/drivers/rpu.py b/drivers/rpu.py
index a0275b2..54bdf12 100644
--- a/drivers/rpu.py
+++ b/drivers/rpu.py
@@ -31,11 +31,17 @@ class Rpu(ModbusDevice):
     def set_charging(self, enable):
         self.write_coil(self._addr("Enable_charger"), enable)
 
+    def read_q128(self, label):
+        return self.read(label) / self.Q128_DIVISOR
+
+    def write_q128(self, label, value):
+        self.write(label, round(value * self.Q128_DIVISOR))
+
     def set_runtime_voltage(self, volts):
-        self.write_holding_register(self._addr("Runtime_voltage_setting_Q128"), round(volts * self.Q128_DIVISOR))
+        self.write_q128("Runtime_voltage_setting_Q128", volts)
 
     def set_runtime_current(self, amps):
-        self.write_holding_register(self._addr("Runtime_current_setting_Q128"), round(amps * self.Q128_DIVISOR))
+        self.write_q128("Runtime_current_setting_Q128", amps)
 
     def read_error_code(self):
         return (self.read("Error_code_hi") << 16) | self.read("Error_code_lo")